Adding a WKWebView programmatically - together with the constraints

gistfile1.txt

private weak var webView: WKWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    // This is needed when using an iOS target < iOS 11.0 - there was a storyboard bug which does not allow instantiating WKWebView from the Storyboard or Xib file
    let webView = WKWebView()
    self.webView.translatesAutoresizingMaskIntoConstraints = false

    self.view.addSubview(webView)
    self.webView = webView

    // Add the constraints to fill in the whole view
    NSLayoutConstraint.activate([
        self.webView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
        self.webView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
        self.webView.topAnchor.constraint(equalTo: self.view.topAnchor),
        self.webView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
    ])
}